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Identifying recent sources and fate of sedimentary nitrogen in the Baltic Sea based on organic matter elemental composition and nitrogen and carbon stable isotopes ratios
Marine Pollution Bulletin ( IF 5.8 ) Pub Date : 2020-09-22 , DOI: 10.1016/j.marpolbul.2020.111622
Aleksandra Winogradow , Janusz Pempkowiak

Sedimentary nitrogen (SN) provenience and fate in surface and subsurface sediments collected from the Baltic Sea were assessed. SN and sedimentary organic carbon (SOC) concentrations, stable isotopic signatures (δ15NSN and δ13CSOC) and SOC/SN molar ratios, were determined in subsequent layers of twenty-four sediment cores dated with 210Pb/137Cs and fifty-seven surface sediments. Sedimentation rates in the range 66–736 g/m2yr−1 (0.05–0.34 cm/year) were measured. Prolonged incubation of sediments in the laboratory led to a 17–37% decrease of SN in surface sediments, and no SN loss in sediments deposited before 1940. Decrease of δ15NSN on incubation (1‰ on average), and gradients of δ15NSN, between recent - surface (3.5‰) vs. 100 years old - subsurface (2.1‰) sediments were attributed to varying contributions of labile nitrogen to the SN pool. Annual deposition of SN to sediment surface and burial in subsurface sediments amounted, respectively, to 5 ± 2 g/m2 and 3.5 ± 1 g/m2.



中文翻译:

根据有机物元素组成和氮碳稳定同位素比,识别波罗的海沉积氮的最新来源和命运

评估了从波罗的海收集的表层和地下沉积物中的沉积氮(SN)来源和归宿。SN和沉积有机碳(SOC)的浓度,稳定同位素特征(δ 15 Ñ SN和δ 13 C ^ SOC)和SOC / Sn摩尔比,在日期为24沉积物核的后续层被确定210的Pb / 137 Cs和五十七个地表沉积物。测得的沉积速率范围为66–736 g / m 2 yr -1(0.05–0.34 cm /年)。实验室中沉积物的长时间孵育导致表面沉积物中SN降低17-37%,并且在1940年前沉积的沉积物中没有SN损失。δ降低15 Ñ SN上培养(1‰平均),和δ的梯度15 Ñ SN,最近之间-表面(3.5‰)对100岁-地下(2.1‰)沉积物归因于到不稳定氮的改变的贡献SN池。SN在沉积物表面的年沉积量和地下沉积物中的埋葬量分别为5±2 g / m 2和3.5±1 g / m 2

更新日期:2020-09-22
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